. Birds of a Maryland farm : a local study of economic ornithology . 3WEEKS AND OLDER ADULT Pig. 17.—Diagram showing proportions of food of American crow (Corvwamericamts), young and adult birds do greal service by feeding to their young not only cutwormsand grasshoppers, bu< also large numbers of weevils and May-beetles. GENERAL REMARKS. Consumption of caterpillars and grasshoppers is the Largest benefit derived from the presence of nestlings on the farm. The parent birds a Most of the stomachs of young and adult crows used ixi the investigation onwhich the results shown in the diagram arc
. Birds of a Maryland farm : a local study of economic ornithology . 3WEEKS AND OLDER ADULT Pig. 17.—Diagram showing proportions of food of American crow (Corvwamericamts), young and adult birds do greal service by feeding to their young not only cutwormsand grasshoppers, bu< also large numbers of weevils and May-beetles. GENERAL REMARKS. Consumption of caterpillars and grasshoppers is the Largest benefit derived from the presence of nestlings on the farm. The parent birds a Most of the stomachs of young and adult crows used ixi the investigation onwhich the results shown in the diagram arc based wen- obtained al Sandy Spring,Mil.: and most of those of young and adul1 crow blackbirds came from Onaga, Kans. Bull. 17, Biological Survey, U. S. Dept. of Agriculture Plate NESTLING. Fig. 1.—House Wren. ADULT. [1, Cutworm ; 2, spider • 3, stink-bug ; I. May-fly ; •>, weevil ; 6, grasshopper.]
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbirdsma, bookyear1902
